Ball-bearing track-drill.



No. 870,194. PATENTED NOV.'5, 1907. c. E. NELSON. BALL BEARING TRACK DRILL.

APPLICATION FILED JUNE 2 1906.

2 SHEET8BH T l.

WITNES'SES:

, Warn d! IPATENTEDNOV. 5, 1907;

G. E. NELSON. BALL BBARING TRAGK DRILL.

APPLICATION FILED JUNE 2.1906."

. I I v v IINI/EIVTOR 0-15. JVZaaw ATTORNEKS WITNESSES:

UNITED STATES Parana OFFICE.

CHARLES ELIS NELSON, OF HARVEY, ILLINOIS.

BALL-BEARING TRACK-DRILL.

To all iv/20m tt may concern:

Be it known that I, CHARLES ELIs NELSON, a citizen of the United States, residing at Harvey, in the county of Cook and State of Illinois, have invented a new and useful lniproven'ient in Ball-Bearing Track-Drills, of which the following is a specification.

This invention relates to a ball bearing track drill and the object of the invention is to provide a drill which can be readily placed in position firmly gripped to the rail, and which is provided with a positive forward feed during a certain predetermined portion of each rotation of the drill, the said feed being automatic and independent of the rotation of the drill.

The invention consists of the novel features of construction hereinafter fully described, pointed out in the claims, and shown in the accompanying drawings, in which,

Figure l. a side elevation of the device complete, and in position for work, a rail and portions of the drill frame being in section. Fig. 2 is a section on the line 2--2 of Fig. 1. Fig. 3 is a plan view of the drill and lower frame certain portions of the said frame and drill holding means being shown in section. Fig. 4 is a sec lion on the line 4t-4 of Fig. Fig. 5 is a detail side view, parts being broken away and parts in section of certain locking mechanism. Fig. 6 is a side elevation of the gripping or overthrow mechanism. Fig. 7 is a plan view of a portion of said overthrow, the hook member being omitted.

In these drawings A represents a base frame to which is detachably connected a tubular vertical post A, provided with depending outwardly curved members A at its lower end. The members A are obliquely slotted as shown at A and these slots engaging suitable pins A carried by the sides of the frame A. The post A is provided at its upper end with oppositely arranged arms A in which is journaled a shaft A provided at each end with crank handles A The shaft also carries a beveled gear A", which Ineshes with a beveled gear B, carried by the upper end of a vertical shaft 15, which extends through the post A. At its lower end the shaft B. carries a beveled gear B The frame A is provided adjacent its rear end with two parallel ears C connected by a bar G. The post A is provided upon its rear face with parallel ears D. which support a. shaft D upon which is mounted an eccentric D A locking lever D is mounted upon this eccentric and at its lower end is provided with a hook member D adapted to engage the bar C. A hand lever D is rigidly secured to the shaft D by means of which the shaft and cam may be rotated. In the frame A is journaled a suitable spindle E which at its forward end is adapted to receive a suitable drill or bit E. The spindle E is provided with a bevel gear E which meshes with the bevel gear B carried upon the shaft B. In

Specification of Letters Patent.

Application filed June 2, 1906- Serial No. 319,908-

Patented Nov. 5, 1907.

the rear end of the frame A a socket F is formed in which I arrange suitable ball cups F, in which are held anti-friction balls F Journaled in the rear of the frame and passing centrally through the socket F is a rotatable sleeve G, which is interiorly threaded, and the rear end portion of the spindle E is also threaded and works in the said sleeve.

A collar H surrounds the sleeve G and rotates with the same, the collar bearing upon the balls F of the ball cup F. Upon one side of the frame A are arranged lugs J between which are pivoted an angled bracket J, consisting of two arms at right angles to each other. The depending arm of the bracket J is engaged by a set screw J 2 which works through the side of the frame A. The other arm of the bracket pivotally supports a hanger J 3 which carries a roller J and a coil spring J 5 is arranged between the depending arm of the bracket J and the hanger J bearing respectively upon each.

The sleeve G has secured thereon a cam G which is adapted to engage the roller J Upon the spindle E is formed a shoulder K and a spring K bears at one end upon this shoulder and upon a cross member K of the frame A. In order to lock the frame and drill to the rail, a frame forming an over-throw L, is loosely connected to the frame members A of the post A. The overthrow L comprises the parallel side members L and the divergent arms L These arms are slotted as shown at L and straddle the members A of the post and are secured thereto by means of pins L which are carried by the post A and which engage the slot L The parallel members of the over-throw L are spaced apart and form between them a guide-way in which works a lever M, said lever being provided with the usual hand locking grip M which engages a suitable rack segment M formed on one of said members L. Sliding also in the guide-way is a shank 0, provided with a hook member O. One of the side members L is slotted as shown at L and the shank O carries a pin 0 which projects through the slot L into a slot M formed in the lever M.

The operation of the device may be briefly described as follows:The drill having been set in position, adjacent the track and the post A having been locked upon the frame A, by means of the locking lever D the lever M is thrown forward to bring the gripping member with its hook O in position for engaging the rail and is then drawn back into the position shown in Fig. 1, thus causing the hook member 0 to grip the rail and bring the drill into close contact with the same. The drill is then started by turning the crank handles A It will be obvious that through the medium of the bevel gears B and B the spindle E will be rotated but will not be fed. The sleeve G will rotate in its bearings with the spindle E until the cam comes into contact with the roller J, when the rotation of the sleeve G will be momentarily checked, and as the spindle E and sleeve G are in threaded engagementwith each other, the rotation of the spindle E relative to the sleeve G, will impart a positive forward feed to the spindle and drill. In the meantime the cam G will force the hanger J toward the side of the frame A and the cam will pass by the roller IT and again rotate in its bearings with the spindle E.

It will be obvious therefore, that during each rotation of the drill there will be a slight iorward feeding movement but that during the greater portion of each rotation, the drill will be cutting without a positive feed, thus enabling the drill to make a good clean, cut.

The forward movement of the drill on each feed is more or less cushioned, by the spring K, which prevents any tendency on the part of the bit or drill to pass through the rail by gouging.

In event of a train appearing during the drilling process, it is only necessary to hit upon the hand lever D and throw forward the lever M 'and the post A, over-throw and hook O can be at once removed from position to permit the train to pass.

Having thus fully described my invention, what I claim, as new and desire to secure by Letters Pa ent is 1. A track drill comprising a frame provided with a socket, a rotatable drill holding spindle mounted in the frame, the rear portion of the spindle being screw-threaded, an interiorly screw threaded sleeve rotatably mounted in said socket, the threaded end of said spindle working in the sleeve, a cam carried by said sleeve, a bracket mounted on one side of the frame, a roller yieldably connected to said bracket, and adapted to momentarily retard the rotation of said sleeve and feed said spindle forwardly as set forth.

2. A track drill' comprising a frame, a spindle having an intcriorly threaded sleeve rotatably mounted in said frame, a portion of the spindle being threaded and adapted to Work in said sleeve, a cam carried by said sleeve, lugs mounted on one side of the frame, an angled bracket comprising a vertical and a horizontal arm, pivoted in said lugs, a hanger pivotally suspended from saidhorizontal arm, a roller mounted in the free end of said hanger and adapted to lie in the path of said cam, a spring bearing against said hanger, and the vertical arm of said bracket and a set-screw Working through the side of the frame and engaging said bracket as set forth.

3. A device of the kind described, comprising a frame a rotatable drill holding spindle mounted in the frame, the rear portion of said spindle beingthreaded, a threaded sleeve rotating in said frame, the threaded portion of the spindle working in said sleeve, a cam carried by the sleeve. an angled bracket, a hanger pivotally connected to one member of said bracket, a spring hearing at one end upon the other member of the bracket and upon the hanger. and a roller carried by said hanger, and in the path of the cam.

CHARLES lflIllS NELSON.

Witnesses Cimnmcs W. CLARK. Hannr K. Ci-xssicn. 

